Macbook pro 13” 2016 A1706 won’t start

So I guess Im in some huge trouble with my Macbook. First, I decided to use some third party software to update it to Sequoia manually. It worked, but then it started to not charge it’s battery even when it is plugged in. The only times it would build up a charge would be only when it’s turned off or in recovery mode. I tried lots of things and restarts, such as SMC, Nvram, turning off optimized power management, nothing helped. Then, it just stopped turning on. It would either show a “low battery” signal, or, when it’s plugged in, refuse to start up completely and/or give any signs of life. My genius idea was to google some YT guides, which recommended me to unplug my battery from the logic board, start it up with a charger, but without the battery plugged, then turn off and plug the battery back in. And as I did everything I mentioned, it never started, and now doesn't start either. No “low battery” icon, no signs of life at all, despite me trying to charge it twice today for hours, and reconnecting everything I touched on the battery that time I unscrewed my mac.

Im on a working trip right now, so taking it to service won’t cut it. I have the screwdrivers, and I have some working hands, but no idea what am I supposed to do. Is there any way I can make it turn on again by myself?